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The GestireNav screenshot dimensions are density-independent, because when we capture the screenshot we scale it to RVH's bounds: https://code.google.com/p/chromium/codesearch#chromium/src/content/browser/frame_host/navigation_entry_screenshot_manager.cc&q=navigation_entry_sc&sq=package:chromium&type=cs&l=136

Thus we don't need to scale it again when we paint during the overscroll gesture.

BUG=402280

Review URL: https://codereview.chromium.org/507083002

Cr-Commit-Position: refs/heads/master@{#292426}